Make a "what's observable tonight" plot.

[zkbt]

It'd be fun to have a plot of the RA + Dec of the targets in a Population that covers the whole sky, but then also has a region on it indicating what might be seen by a particular telescope on a particular night. This is basically remaking TheSkyX's sky viewer and/or Stellarium and/or any local map of the sky, but with systems we might want to observe.

• One basic version of that might be just a rectangle indicate where the hour angle (= local sidereal time - RA) is less than 4 hours and the declination is within 60 degrees of the telescope latitude.
• One slightly more kickass version would be a more complicated curvy boundary indicating where the zenith angle of a star would be <60 degrees (= 1 < airmass < 2). You might need to use astroplan for this?

It'd be awesome if you could please write this a Python function that takes in a Population object, an observatory location, and a time/date.

[zkbt]

For some more notes on "One basic version of that might be just a rectangle indicate where the hour angle (= local sidereal time - RA) is less than 4 hours and the declination is within 60 degrees of the telescope latitude.":

• In your nice plots of RA + Dec, this will end up looking like a box.
• The declinations that are good are ones where |declination - latitude| < 60˚.
• The RAs that are good are ones where |local sidereal time (probably calculated from astropy or astroplan) - RA| < (4 hours = 60˚).

[zkbt]

For some more notes on "One slightly more kickass version would be a more complicated curvy boundary indicating where the zenith angle of a star would be <60 degrees (= 1 < airmass < 2). You might need to use astroplan for this?":

• Generate arrays of altitude + azimuth positions, where altitude is always +30˚ (= 60˚ away from zenith) and azimuth linearly spans 0-360˚.
• Use astropy or astroplan to convert those altitudes and azimuths from a given location and at a given time into RA and Dec. Plot that converted range of RA and Dec on top of your map of exoplanets.
• Marvel and wonder and applaud!